HPCC-12468 Belongs to superfile tab added

Add a tab that displays any superfiles that the subfile may belong to.
There can be multiple superfiles that a subfile can belong to so adding a tab
to show multiples if needed.

Signed-off by: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Sorry to be as pain but, I would make this:
Superfiles: "Superfiles"